Author(s):

Ramraj Sen, SK Singh, Pooran Chand, SA Kerkhi, Gopal Singh and Mukesh Kumar

Abstract: Analysis of variance among line with respect to gca was observed highly significant for all the characters. The variance among testers with respect to gca was recorded highly significant for all the traits while variances among crosses due to interaction between lines x testers genotypes with respect to sca were expressed also highly significant for all the attributes except leaf stem ratio which indicated that both additive and dominance genetic variance were involved in the determination of these characters and the parents and their progenies differed for their combining ability effects. Average degree of dominance (δ²_s/δ²_g) ^0.5 exhibited partial dominance for leaf breadth, number of leaves per plant, leaf area, stem girth and leaf stem ratio, suggesting there by the preponderance of additive type of gene action with partial dominance in the expression of these characters in forage sorghum. Over dominance was recorded for days to 50% flowering, plant height, leaf length, total soluble solids, protein content and green fodder yield per plant which indicated that gene action is fixable and these attributes played an important role for population improvement in this crop. Lines G-48, UP Chari-1, HC-171 and MP Chari were appeared as good general combiners. These parents may be handled in suitable breeding programme visa-vis selection breeding for improvement productivity of green fodder yield and per unit area in forage sorghum. The F₁’s hybrids i.e. UP Chari-4 x HC-171, UP Chari-4 x HJ-513, UP Chari-1 x MP Chari and Jawahar Chari-6 x HJ-513 were proved to be as best specific combiners for maximum attributes including green fodder yield per plant for 8 to 9 other contributing characters, which may be utilized for obtaining transgressive segregants in the next generation.

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